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Birthweight and the risk of atopic diseases: the ISAAC Phase III study

Edwin A Mitchell, Tadd Clayton, Luis García-Marcos

    Pediatric Allergy and Immunology : Official Publication of the European Society of Pediatric Allergy and Immunology
    |April 23, 2014
    PubMed

    Insights

    Low birthweight increases asthma risk but not rhinoconjunctivitis. Eczema findings were inconclusive in this large international study on childhood allergies.

    Area of Science:

    • Pediatric Allergy and Immunology
    • Epidemiology of Allergic Diseases
    • Birthweight and Health Outcomes

    Background:

    • Conflicting evidence exists regarding the link between birthweight and common childhood allergic conditions.
    • Understanding these associations is crucial for early identification and prevention strategies.

    Purpose of the Study:

    • To investigate the relationship between birthweight and the prevalence of asthma, eczema, and rhinoconjunctivitis symptoms in children.
    • To clarify the role of birthweight as a risk factor for these allergic conditions.

    Main Methods:

    • International study involving 162,324 children aged 6–7 years across 60 centers in 26 countries.
    • Parental questionnaires collected data on allergic symptoms (asthma, eczema, rhinoconjunctivitis) and birthweight.
    • Statistical analysis examined associations between birthweight categories and symptom prevalence.

    Main Results:

    • Low birthweight (<2.5 kg) was significantly associated with an increased risk of current wheeze (asthma symptoms).
    • Low birthweight showed a reduced association with ever having eczema.
    • No significant association was found between low birthweight and rhinoconjunctivitis, nor between high birthweight (≥4.5 kg) and any of the studied outcomes.

    Conclusions:

    • Confirms low birthweight as a risk factor for asthma symptoms.
    • Low birthweight is not a risk factor for rhinoconjunctivitis.
    • The association between low birthweight and eczema requires further investigation due to equivocal findings.
    Abstract

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